Smoke-consuming furnace.



No; 769,060. I i PATENTED AUG. 30; 1904.,

J. A. CRAWFORD.

SMOKE GONSUMING FURNACE.

APPLIOATION FILED JAN. 9. 1904.

N0 MODEL.

v :Mi km 5 NVENTOR UNITED STATES Patented August so, 1904.

PATENT OFFICE.

SMOKE-CONSUMING FURNACE.

SPECIFICATION forming part of Letters Patent No. 769,060, dated August 30, 1904, Application filed January 9, 1904:. Serial No. 138,388. (No model.)

To all whom it may concern:

Be it known that I. J OI-IN A. CRAWFORD, a

citizen of the United States, residing at Allein furnaces of that kind or class commonly known as smoke consuming furnaces wherein air or steam or air and steam, commingled are injected into the fire-chamber of the furnace to promote combustion, and thus consume the unburned products which usually are carried out of the furnace by the draft.

The object'of the inventionis to simplify and improve furnaces of this character by providing them with means whereby the combustion will be greatly promoted and the objectionable products of escaping smoke and the generated and accompanying gases will be.

consumed and reduced within the confines of the fire-chamber.

Another object is to make the apparatus applicable to fire of any height within the firechamber, as will be hereinafter fully described and the novelty claimed particularly and definitely pointed out..

.My present invention is based on the lines of improvement associated with the principle of the inventions disclosed in my prior Patents Nos. 539,768, 5l0,780,.586,t77, 638,800, 647,078, and 658,703and is designed to improve -and perfect the constructions and operative aggroupments of appliances therein shown and described.

I have fully and'clearly illustrated my im provements in the accompanying drawings, forming a part of this specification, and where- 1n Figure 1 is a side elevation of a furnace wherein are embodied my improvements, the

f illustration being partly in longitudinal vertical section to indicate the hot-air fiues andthe cold-air fluesand the wall of the furnace being partly broken away toshow the disposition or arrangement of the steam-induction pipe. Fig. 2 is a transverse vertical section through the walls of thefurnace, showing the vertical channels and the pipe-channels with appliances are duplicates in each wall, similar reference notations indicate like parts.

G C designate the side walls of the furnace, in each of which is formeda horizontally-disposed channel 1, positioned well above the grate-bars, as indicated, and preferably extending the full length of the wall. In the walls of the. furnace below the grate-bars are formed openings 2, which lead into vertical passages 3, (shown in dotted lines in Fig. 1,) and opening at their upper ends into the horizontal space 1, which openings and communicating passages constitute the cold-air fiues to deliver cold air from the ash-pit into the hori- Zontal space 1 for the purpose of supplying cool air to the space and for preserving the walls from the effect of the intense heat. In the fire-chamber above the grate-bars are formed openings 4, from 'the rear ends of which within the walls lead vertical passages 5, which are preferably disposed intermediate the cold-air passages and at their upper ends open into the horizontal channel 1, serving the purpose of taking heated currents from the fire-chamber and delivering them to the channel 1, whence they are delivered to the firechamber through the return slots or passages 6 7. The return-slots are arranged in upper and lower parallel series, as shown in the drawings, and are made with downwardly-inclined floors, as shown in Fig. 2 of the drawings, so as to.provide space for the movement of the steam jet-pipes to be regulated to deliver the steam and air at a proper and required height relatively to the amount of fuel in the fuelchamber.

- In the channel 1 is arranged and positioned the steam-conducting pipe, consisting ofsuitable pipes disposed parallel with-each other,

as shown, and having their inner ends united by an elbow coupling-piece 10, the parts or members of the pipe being designated by 8 9. At determined distances in the limbs of the pipe are fixed laterally-projecting steam jetpipes 11, disposed inalinementwith the slots 6 7, into which they extend with their free ends in proper position to deliver the steam into the fire-chamber of the furnace. Usually these jet-pipes stand horizontally and deliver the steam accordingly; but since the height of the steam-pipes is stationary and the fuelsurface may vary in height it is proposed to suit the direction of the steam to the height of the fire, and this I effect by the following proposed means: The inner ends of the pipes 8 9 are screwed into the ends of the coupling 10, and the other ends of these pipes are extended a proper distance through the front of the furnace, as at 12, and on the projecting ends are secured coupling nuts or sleeves 13 14, sothat by applying a suitable wrench to the sleeves the pipes 8 9 may be turned on their axes sufficiently to depress or elevate the steam jet-pipes to suit the condition of the fuel in the furnace, and thus adapt them to deliver the discharging steam at the proper angle over or .onto the fuel.

In the dome 15 of the boiler is let a suitable pipe 15, provided with a turning plug 17 to regulate the flow of steam. The pipe 16 is carried to a suitable point and then turned down vertically, as at 18, and let into a horizontally-disposed cross-pipe 19, which extends across the front of the furnace and has its ends turned inward and coupled to the projecting ends of the upper pipes 8. In the pipe 18 is a suitable turning plug 20 to regulate the steam through the pipes. The outer end of the pipe or limb 9 has connected to it a depending piece of pipe 21, which serves as a drip-pipe or when occasion requires to blow ofi the pipes to clean them from any accumulated substance, a turning plug 22 being interposed to shut off or regulate the steam through the pipe.

The action or operation of the apparatus may be stated as follows: The furnace being fired up and becoming active the steam may be turned on from the dome and finds its way into the pipes 8 9 and out through the jetpipes 11. At the same time the air from the ash-pit ascends up through the passages into the channel and the hot drafts ascend through the passages 4: and 5 and out through the slots 6 7 and mingle with and charge the steamjets, creating a strong inducement to com bustion and also tends to preserve the side walls adjacent to the steam jet-pipes.

.Having thus described my invention, what I claim is 1. In a furnace, the combination of the side walls formed with horizontal channels above the grate-bars and slots opening therefrom into the fire-chamber, upper and lower parallel steam-pipes disposed in the said channels and communicating at their inner ends, steam jet-pipes secured in said steam-pipes projecting into the said slots, means to conduct steam into the steam-pipes, and means to turn the parallel steam-pipes on their axes.

2. In a furnace, the combination of the side walls formed with horizontal channels above the grate-bars and slots opening therefrom into the fire-chamber, upper and lower parallel steam-pipes disposed in the channels communicating at their inner ends and having a limited rotation on their axes, steam jet-pipes secured in the steam-pipes and projecting into the said slots to rock vertically therein, and means to conduct steam into the parallel steam-pipes. I

' 3. In a furnace, the combination of the side walls formed with horizontal channels above the grate-bars and slots opening therefron'i into the fire-chamber, vertical cold-air channels opening from below the grate-bars and leading into the horizontal channels, vertical hot-air channels opening from above the gratebars and leading into the horizontal channels, upper and lower parallel steam-pipes disposed in the horizontal channels and communicating at their inner ends and having a limited rotation on their axes and having their front ends projecting through the face-plate of the furnace, steam jet-pipes secured in the steampipes and projecting into the said slots, steampipes secured to the outer ends of the upper pipes in the horizontal channels and blow-oil' and drip pipes connected to the outer ends of the lower pipes in the horizontal channels, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN A. CRA\VFOR1).

Witnesses:

CHAs. E. RIonDoN, A. G. HEYLMUN. 

